A string trimmer is an essential tool for maintaining neat lawn edges and clearing weeds, but its effectiveness hinges on having fresh, properly loaded cutting line. Over time, the string wears down, breaks, or gets stuck, making it necessary to replace it. For many, this task can seem daunting, but with a few simple steps and the right technique, replacing the string on your trimmer can be a quick and easy process. This guide will walk you through the common methods, ensuring your trimmer is back to peak performance in no time.
Safety First: Preparing for String Replacement
Before you begin any work on your string trimmer, safety is paramount. Always ensure the tool is completely powered off and secured to prevent accidental starts.
- Disconnect Power: For electric trimmers, unplug the tool from the power source. For gasoline-powered trimmers, disconnect the spark plug wire to prevent accidental ignition. For battery-powered trimmers, remove the battery pack.
- Wear Gloves: The cutting head and any remaining string can have sharp edges. Wearing sturdy work gloves will protect your hands.
- Clear the Area: Ensure you have a clean, flat surface to work on.
Understanding Your Trimmer Head Type
Most string trimmer use one of a few common string feed mechanisms. Identifying yours will determine the replacement method.
- Bump Feed Heads: These are the most common. You tap the trimmer head on the ground to advance more line. They typically have a spool inside that you manually wind.
- Automatic Feed Heads: These automatically advance the line as it wears down, often using centrifugal force. They are usually pre-spooled or require specific cartridges.
- Fixed Line Heads: These use pre-cut lengths of string that are manually inserted into holes in the trimmer head. There is no spool to wind.
Tools and Materials You’ll Need
- New Trimmer Line: Ensure you have the correct diameter (gauge) and type of line recommended for your trimmer. Check your owner’s manual or the trimmer head itself for specifications.
- Scissors or Utility Knife: For cutting the line.
- Pliers (Optional): Can be helpful for removing stubborn pieces of old line.
Step-by-Step String Replacement Methods
Method 1: Replacing String on a Bump Feed Head (Most Common)
- Remove the Spool Cap: Locate the tabs or clips on the trimmer head. Press them in or twist the cap counter-clockwise to remove it.
- Remove the Spool: Take out the inner spool. Note how the old line was wound and any arrows indicating winding direction.
- Remove Old Line: Discard any remaining old line from the spool.
- Cut New Line: Cut a new length of trimmer line. The recommended length is usually between 15 to 25 feet (4.5 to 7.5 meters), but check your manual. For spools with two separate compartments, cut two equal lengths.
- Find the Center (for single line spools): If your spool has two holes and you’re winding a single continuous line, find the midpoint of your cut line and insert it into the center slot on the spool.
- Wind the Line:
- Single Line Spool: Wind the line tightly and evenly onto the spool in the direction indicated by arrows (usually clockwise). Ensure the line doesn’t overlap excessively.
- Dual Line Spool: Insert one end of each cut line into its respective hole on the spool. Wind each line tightly and evenly onto its side of the spool, following the winding direction arrows.
- Secure the Ends: Most spools have small notches or eyelets on the edge to temporarily hold the last few inches of line. Secure the ends here.
- Thread Through Eyelets: Carefully thread each line end through the corresponding metal eyelet on the trimmer head casing.
- Replace Spool and Cap: Align the spool with the casing, ensuring the lines are threaded correctly. Push the spool firmly into place. Replace the spool cap, ensuring it clicks securely into position.
- Test: Gently pull on the lines to ensure they are secure.
Method 2: Replacing String on an Automatic Feed Head (Cartridge System)
- Remove Old Cartridge: Follow your trimmer’s instructions to remove the empty or broken line cartridge. This often involves pressing release buttons or twisting.
- Insert New Cartridge: Simply insert the new pre-wound cartridge into the trimmer head until it clicks into place.
- Extend Line (if necessary): Some models require you to pull a short length of line out manually or activate a button to feed it.
Method 3: Replacing String on a Fixed Line Head
- Remove Old Lines: Pull out any remaining old, worn-down line segments.
- Cut New Lines: Cut several new lengths of trimmer line according to your trimmer’s specified length (usually 10-12 inches, or 25-30 cm).
- Insert New Lines: Thread one end of each cut line through the designated holes in the trimmer head until the line is centered. Some heads may have a locking mechanism to hold the line in place.
Post-Replacement Tips
- Proper Line Storage: Store new trimmer line in a cool, dry place. Soaking it in water for 24 hours before use can make it more flexible and less prone to breaking.
- Don’t Overfill: Overfilling a spool can cause jamming. Stick to the recommended line length.
- Regular Checks: Periodically check your trimmer line during use and replace it before it gets too short, which can strain the motor.
By following these straightforward steps, you can confidently replace the string on your trimmer, ensuring it’s always ready to deliver clean cuts and keep your yard looking its best.
